You are just looking for a regular pool pump. These days the local
energy code might require that to be 2 speed. I have had pretty good
luck with the Hayward 3/4HP 2 speed but StaRite works OK too.
They are all repairable. The biggest thing you can do to make it last
longer is to build a dog house around it and keep it out of the
weather. Use quick disconnect couplings on the water lines and take it
inside in winter. It will last for decades that way.
Make sure this is on a GFCI.

I wonder what the big issue is? Crazy fear that someone is going
to get lung cancer from the fine dust when it's in water and mixed
with sewage and crap that will quickly bind it up?
For a small pool a

I have no experience with above ground pools, only spas and inground pools,
but that sounds reasonable. But the poster said he wanted to switch to
sand. I don't see sand being used here for new installs, at least not for
inground. If we had more info maybe we'd learn what the issues/problems
are. Somebody said that with inground the pump and filter can be one unit,
which also could make sense related to the question regarding changing
the pump.

I've seen people here years ago flipping out, worrying about DE because
they see the warnings on the bags, which is essentially that it's very
fine powder, so like most of those dusts, breathing it can be harmful. But
that's when it's dry and in the air. When I pump it out on the lawn,
it just disappears into the grass and soil. Any small amounts wind up
caked up, mixed up with crap from the filter, etc, not going anywhere.
In fact DE is also sold as a soil improvement product. If you had to
backwash and contain the DE, IDK what you'd do, it would seem to be a
big problem. What do you do? Get a filter to filter the filter?

Once it's up and running, about every 3 weeks. Starting it up, depending
on how dirty it is, could be a few days. It only looks real bad, green,
etc, the first time or two when starting it up for the season. After
that, it will be darkish, gray, but not really that bad.

I left ours exposed to the weather during the summer months. The
diatomaceous earth filter was made of stainless steel and large enough
that I didn't want to mess with it so it stayed on the concrete pad,
exposed.
I always disconnected pump and put it in an unheated shed for the winter
AFTER completely draining the pump and strainer. Then I filled the pump
housing with RV Anti-freeze and put plastic wrap over the pipe openings
to keep the seals wet. Never had a problem with either one.

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